Dedup Garmin data storage, configurable chart colors, taxonomy fixes, sync/progression fixes

- Remove duplicated Garmin fields from storage; decode display-only fields
  (activity name/type, lap duration/HR, structured workout raw JSON) from
  RawJSON at API-response time instead of storing redundant columns
- Add a fully configurable chart color system (pace/HR main-line colors, 4
  effort-kind colors, tint/darken/brighten intensity knobs) under Profile >
  Chart colors
- Rename training types and fix their display order (Easy, Long, 60'/30'
  Threshold, Tempo, Intervals, MAS Test, Race) everywhere they're listed
- Add an Efficiency Factor progression metric; fix Progression chart axes to
  use tight non-zero-based domains, m:ss/km pace formatting, and rounded
  ticks instead of raw floating-point labels
- Expose the raw get_workout_by_id() payload in the raw-data viewer
  alongside activity/lap/detail JSON; enlarge the modal and shrink array
  indentation for readability
- Fix "last sync" reporting a meaningless activity count: record one
  combined sync run per manual "Sync now" and count genuinely new
  activities instead of re-listing whatever Garmin returned for the queried
  window
- Let a Review Queue activity be manually cleared back to Unclassified, and
  make "Reset all" available even while disconnected from Garmin

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

backend/cmd/seedsample/main.go

@@ -152,17 +152,17 @@ func seedActivity(ctx context.Context, db *store.DB, p seedParams) int64 {
 	anaerobic := p.anaerobicTE
 	id, err := db.UpsertActivity(ctx, store.Activity{
 		GarminActivityID:        p.garminID,
-		ActivityName:            p.name,
-		ActivityType:            "running",
 		StartTimeUTC:            p.start.Format("2006-01-02 15:04:05"),
-		BeginTimestampMs:        p.start.UnixMilli(),
 		DurationSeconds:         p.duration,
 		DistanceMeters:          p.distance,
 		AvgSpeedMps:             &speed,
 		AvgHR:                   &hr,
 		AerobicTrainingEffect:   &aerobic,
 		AnaerobicTrainingEffect: &anaerobic,
-		RawJSON:                 "{}",
+		// ActivityName/ActivityType aren't stored columns anymore -- the API
+		// decodes them from RawJSON, so seeded activities need them here to
+		// still show a sensible name/type in the dev UI.
+		RawJSON: fmt.Sprintf(`{"activityName":%q,"activityType":{"typeKey":"running"}}`, p.name),
 	})
 	must(err)
 	return id
@@ -213,9 +213,14 @@ func seedIntervalLapsAndSamples(ctx context.Context, db *store.DB, activityID in
 		}
 
 		laps = append(laps, store.Lap{
-			LapIndex: i + 1, DurationSeconds: lapDuration,
-			DistanceMeters: 400, IntensityType: intensity, RawJSON: "{}",
-			HRDriftBpmPerMin: drift, HRRecoveryBpmPerMin: recovery,
+			LapIndex:      i + 1,
+			IntensityType: intensity,
+			// DurationSeconds/AvgHR aren't stored columns anymore -- the API
+			// decodes them from RawJSON, so seeded laps need them here to
+			// still show a sensible duration/HR on the dev chart.
+			RawJSON:             fmt.Sprintf(`{"duration":%v,"distance":400,"averageHR":%v}`, lapDuration, baseHR),
+			HRDriftBpmPerMin:    drift,
+			HRRecoveryBpmPerMin: recovery,
 		})
 		elapsed += lapDuration
 	}